auto save

my_tree.py

+import turtle
+
+pen = turtle.Turtle()
+pen.color('sienna')
+
+w = turtle.Screen()
+w.bgcolor('wheat')      # wheat小麦
+pen.left(90)
+pen.speed(0)
+
+def tree(n):
+    if n>=50:
+        pen.fd(n)
+        pen.right(30)
+        tree(n-10)
+        pen.left(30)
+        pen.left(30)
+        tree(n-10)
+        pen.right(30)
+        pen.pu()
+        pen.backward(n)
+        pen.pd()
+pen.pu()        
+pen.backward(150)
+pen.pd()
+a=tree(100)
+
+#pen.left(90)
+#pen.fd(100)
+#pen.left(30)
+#pen.fd(100)
+#pen.up()
+#pen.backward(100) 
+#pen.pd()
+#pen.right(60)
+#pen.fd(100)
+#pen.pu()
+#pen.backward(100)   # 后退
+#pen.down()
+
+turtle.done()